Test-tube



(No Model.)

. J. G. WHARTON.

TEST TUBE.

No. 431,132. Patented July 1,1890.

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UNITED STATES PATENT OEFIo JOHN C. \VHARTON, OF NASHVILLE, TENNESSEE.

TEST-TU BE.

SPECIFICATION fuming part of Letters Patent No. 431,132, dated July 1,1890.

Application filed October 2 1, 1889. Serial No. 327,741. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN ORIDDLE WHAR- TON, a citizen of the UnitedStates, residing at Nashville, in the county of Davidson and State ofTennessee, have invented certain new and useful Improvements inTest-Tubes, of which the following is a specification.

My invention relates to improvements in test-tubes, whereby a roughenedsurface may be given to the outer side, and,when desired, the same partof the test-tube maybe stained or enameled. The roughening may be areoomplished by any suitable process, such as etching with acid, grinding,or by means of the sand-blast, &c. The enameling, when done, shouldprecedethe roughening.

flhe drawing shows one of my improved test-tubes roughened on the partA.

The objects of this improvement are to provide a test-tube (ortest-tubes) with a roughened surface, (or surfaces,) upon which marks orwriting may be made with an ordinary pencil or other suitableinstrument, in order to label the test-tube easily, to denote itscontents during experimental or analytical Work, and to provide for theeasy removal of the marks or labels after they have served theirpurposes; also, in certain cases to provide for greater Visibility ofthe Writing upon the tubes by enameling or staining the glass upon whichthe roughening process is to be performed.

This improvement is designed to furnish a useful substitute for paperlabels, in not being liable to be scorched or burned, or to be effacedor obscured by the contact of acids, &c., which paper labels areincapable of withstanding, the paper labels being, moreover, moreinconvenient to attach and remove when necessary.

The manner in which this improvement will alfect the test-tubes isclearly shown in the accompanying drawing, which is a View inperspective, the shaded band at the upper part of the tube representingthe roughened or ground surface, as well as the portion enameled whenthe latter object is carried out.

Having thus fully described my in vention, what I claim, and desire tosecure by Letters v Patent, is

1. A test-tube having a ground or roughened external surface, for thepurpose specified, substantially as set forth.

2. A test-tube having a part or the whole of its external surfaceenameled and roughened or ground, substantially as described.

J. o. wnAnToN.

Witnesses:

RUEE M. FIELDs, F. Roman.

